Why do some employees, in the IDP module, show “Request a SRPE” and others do not? 

Initially, the IDP/SRPE database was set up to show all GS-12s/Equivalents and above as needing a SRPE.  However, all AAW members are eligible for a SRPE, if the supervisor so desires.  Just click on the words “SRPE Not Required” and it will take you to the same link as if you clicked on “SRPE Required”.